How to create the output Video using Videowriter.

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VENKATA NARESH MALLADI 2017-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/332912-how-to-create-the-output-video-using-videowriter

重新打开： VENKATA NARESH MALLADI 2017-3-31

I am tracking an object by mouse selection and want to save the video with tracking results. Here is my code.

videoReader = vision.VideoFileReader('1.mp4'); videoFrame = step(videoReader); figure; imshow(videoFrame); title('Select the Object'); rect = getrect; bboxPoints = bbox2points(rect(1, :)); pointTracker = vision.PointTracker('MaxBidirectionalError', 2); points = bboxPoints; initialize(pointTracker, points, videoFrame); videoPlayer = vision.VideoPlayer('Position',... [100 100 [size(videoFrame, 2), size(videoFrame, 1)]+30]); oldPoints = points; while ~isDone(videoReader)

    videoFrame = step(videoReader);
    [points, isFound] = step(pointTracker, videoFrame);
visiblePoints = points(isFound, :);
    oldInliers = oldPoints(isFound, :);
    if size(visiblePoints, 1) >= 1 % need at least 2 points
        [xform, oldInliers, visiblePoints] = estimateGeometricTransform(...
            oldInliers, visiblePoints, 'similarity', 'MaxDistance', 4);
        bboxPolygon = reshape(bboxPoints', 1, []);
        videoFrame = insertShape(videoFrame, 'Polygon', bboxPolygon, ...
            'LineWidth', 2); 
        videoFrame = insertMarker(videoFrame, visiblePoints, '+', ...
            'Color', 'white');       
        oldPoints = visiblePoints;
        setPoints(pointTracker, oldPoints);        
    end
    % Display the annotated video frame using the video player object
    step(videoPlayer, videoFrame);
     % stop(reader);
end